@chakster I’m not sure why you keep recommending cartridges that aren’t in production and nearly impossible to find.
I feel your pain Greg, but they are not "impossible to find", those two models i have mentioned are for sale on ebay very often from many different sellers in USA or EU, even NOS samples.
If you don’t search you will not find, but if you do then you will find and it’s not a big deal. I managed to buy them all, nearly all Stanton and Pickering line (top upper 5 models of each brand).
If you’re in USA then it’s first brand to search for, because you can find local dead stock and stuff like that for very low price (almost nothing), ebay prices are higher for sure, i have mentioned ebay prices (and other sources like UK Audio Mart of US Audio Mart are very helpful.
I recommend them because i like the sound so much!
Maybe you’re not looking for some NOS cartridges, but i’m sure you are aware of NOS tubes and NIB are still available even if they are from the 30’s like some tubes i bought for my amp this year.
Regarding rare cartridge you can simply ask me if you can’t find them yourself.
Remember those endless Mm thread and seems like everyone was able to find many top class vintage cartridges (even in NOS, sealed boxes).